The fastest way to recreate buildings from real world cities in Blender
Go to OpenStreetMap, and make sure you are using the default layer on the right-side menu.

Use the Share Option, then on the lower part use the SVG (or PDF) option to export the visible area. Adjust the scale before exporting if you want any semblance of metric precision or accurate measurements



Either import it directly into Blender, or if you wish do some cleanup in Inkscape and remove unwanted or unneeded parts.

You can then easily extrude buildings directly as curve or convert to mesh for more complex or detailed modelling.



Have in mind that it still requires the desired area to be mapped and have actual building information.